From e3dd169d63dcded0fc787e10ec1cf6520fb5028b Mon Sep 17 00:00:00 2001
From: Anthony Minessale <anthm@freeswitch.org>
Date: Mon, 27 Mar 2017 17:23:41 -0500
Subject: [PATCH] blah

---
 libs/libks/src/ks_mutex.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/libs/libks/src/ks_mutex.c b/libs/libks/src/ks_mutex.c
index d21271d476..b21f696343 100644
--- a/libs/libks/src/ks_mutex.c
+++ b/libs/libks/src/ks_mutex.c
@@ -431,6 +431,7 @@ struct ks_rwl {
 	SRWLOCK rwlock;
 	ks_hash_t *read_lock_list;
 	ks_mutex_t *read_lock_mutex;
+	ks_mutex_t *write_lock_mutex;
 #else
 	pthread_rwlock_t rwlock;
 #endif
@@ -484,6 +485,10 @@ KS_DECLARE(ks_status_t) ks_rwl_create(ks_rwl_t **rwlock, ks_pool_t *pool)
 		goto done;
 	}
 
+	if (ks_mutex_create(&check->write_lock_mutex, KS_MUTEX_FLAG_DEFAULT, pool) != KS_STATUS_SUCCESS) {
+		goto done;
+	}
+
 	InitializeSRWLock(&check->rwlock);
 #else
 	if ((pthread_rwlock_init(&check->rwlock, NULL))) {
@@ -502,6 +507,7 @@ KS_DECLARE(ks_status_t) ks_rwl_read_lock(ks_rwl_t *rwlock)
 {
 #ifdef WIN32
 
+	ks_mutex_lock(rwlock->write_lock_mutex);
 	ks_mutex_lock(rwlock->read_lock_mutex);
 
 	int count = (int)(intptr_t)ks_hash_remove(rwlock->read_lock_list, (void *)(intptr_t)ks_thread_self_id());
@@ -509,6 +515,7 @@ KS_DECLARE(ks_status_t) ks_rwl_read_lock(ks_rwl_t *rwlock)
 	if (count) {
 		ks_hash_insert(rwlock->read_lock_list, (void *)(intptr_t)ks_thread_self_id(), (void *)(intptr_t)++count);
 		ks_mutex_unlock(rwlock->read_lock_mutex);
+		ks_mutex_unlock(rwlock->write_lock_mutex);
 		return KS_STATUS_SUCCESS;
 	}
 
@@ -520,6 +527,7 @@ KS_DECLARE(ks_status_t) ks_rwl_read_lock(ks_rwl_t *rwlock)
 #ifdef WIN32
 	ks_hash_insert(rwlock->read_lock_list, (void *)(intptr_t)ks_thread_self_id(), (void *)(intptr_t)(int)1);
 	ks_mutex_unlock(rwlock->read_lock_mutex);
+	ks_mutex_unlock(rwlock->write_lock_mutex);
 #endif
 
 	return KS_STATUS_SUCCESS;
@@ -536,6 +544,7 @@ KS_DECLARE(ks_status_t) ks_rwl_write_lock(ks_rwl_t *rwlock)
 	}
 
 #ifdef WIN32
+	ks_mutex_lock(rwlock->write_lock_mutex);
 	AcquireSRWLockExclusive(&rwlock->rwlock);
 #else
 	pthread_rwlock_wrlock(&rwlock->rwlock);
@@ -548,6 +557,10 @@ KS_DECLARE(ks_status_t) ks_rwl_write_lock(ks_rwl_t *rwlock)
 KS_DECLARE(ks_status_t) ks_rwl_try_read_lock(ks_rwl_t *rwlock)
 {
 #ifdef WIN32
+	if (ks_mutex_trylock(rwlock->write_lock_mutex) != KS_STATUS_SUCCESS) {
+		return KS_STATUS_FALSE;
+	}
+
 	ks_mutex_lock(rwlock->read_lock_mutex);
 
 	int count = (int)(intptr_t)ks_hash_remove(rwlock->read_lock_list, (void *)(intptr_t)ks_thread_self_id());
@@ -555,11 +568,13 @@ KS_DECLARE(ks_status_t) ks_rwl_try_read_lock(ks_rwl_t *rwlock)
 	if (count) {
 		ks_hash_insert(rwlock->read_lock_list, (void *)(intptr_t)ks_thread_self_id(), (void *)(intptr_t)++count);
 		ks_mutex_unlock(rwlock->read_lock_mutex);
+		ks_mutex_unlock(rwlock->write_lock_mutex);
 		return KS_STATUS_SUCCESS;
 	}
 
 	if (!TryAcquireSRWLockShared(&rwlock->rwlock)) {
 		ks_mutex_unlock(rwlock->read_lock_mutex);
+		ks_mutex_unlock(rwlock->write_lock_mutex);
 		return KS_STATUS_FAIL;
 	}
 #else
@@ -571,6 +586,7 @@ KS_DECLARE(ks_status_t) ks_rwl_try_read_lock(ks_rwl_t *rwlock)
 #ifdef WIN32
 	ks_hash_insert(rwlock->read_lock_list, (void *)(intptr_t)ks_thread_self_id(), (void *)(intptr_t)(int)1);
 	ks_mutex_unlock(rwlock->read_lock_mutex);
+	ks_mutex_unlock(rwlock->write_lock_mutex);
 #endif
 
 	return KS_STATUS_SUCCESS;
@@ -635,6 +651,7 @@ KS_DECLARE(ks_status_t) ks_rwl_write_unlock(ks_rwl_t *rwlock)
 
 #ifdef WIN32
 	ReleaseSRWLockExclusive(&rwlock->rwlock);
+	ks_mutex_unlock(rwlock->write_lock_mutex);
 #else
 	pthread_rwlock_unlock(&rwlock->rwlock);
 #endif